The angular distributions of the rare decays B → K +µ +µ - and B 0 → K 0 aSμ +μ - are studied with data corresponding to 3 fb -1 of integrated luminosity, collected in proton-proton collisions at 7 and 8TeV centre-of-mass energies with the LHCb detector. The angular distribution is described by two parameters, FH and the forward-backward asymmetry of the dimuon system A FB, which are determined in bins of the dimuon mass squared. The parameter F H is a measure of the contribution from (pseudo)scalar and tensor amplitudes to the decay width. The measurements of A FB and F H reported here are the most precise to date and are compatible with predictions from the Standard Model.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics